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The URL shown in the screenshot was the usual one for AdSense. I also saw a couple strange AdSense ads this week on small sites (definitely couldn't have custom arrangements) with no "Ads by Google" line on some, but not all their ad blocks.

Dan's right. I'm not saying it's not a violation, just that I rarely ever presume. The screenshot is too sketchy to me. I don't know what I'm looking at, I don't know what's under the big bright red boxes. It might be best to either contact the site directly and ask or just provide a link to them. Or contact Google. I'm not getting much from the screenshot, myself.

There's been quite a few of these new formats going through the system recent, and I think it's a pretty good idea. Anything that keeps the ad units looking new and fresh should make ad-blind visitors give them a second glance.